Asked October 18, 2016, 6:36 PM EDT
Logan County Ohio
Insecticides containing Bifenthrin, Carbaryl or Permethrin are the only trunk sprays proven to protect pines. These should be applied until they runoff not just misting the tree. They should be applied into fissures and cracks and around the base of the trunk, including the entire tree using a hydraulic sprayer with at least 250 psi for small trees. Each tree needs to be sprayed in this manner not just in an area around the perimeter. There is no mention made of injection of insecticides.